LM4895LDX National Semiconductor, LM4895LDX Datasheet

LM4895LDX

Manufacturer Part Number

LM4895LDX

Description

Manufacturer

National Semiconductor

Datasheet

1.LM4895LDX.pdf (15 pages)

Specifications of LM4895LDX

Operational Class

Class-AB

Audio Amplifier Output Configuration

1-Channel Mono

Output Power (typ)

1.4x1@4OhmW

Audio Amplifier Function

Speaker

Total Harmonic Distortion

0.1@8Ohm@400mW%

Single Supply Voltage (typ)

3/5V

Dual Supply Voltage (typ)

Not RequiredV

Power Supply Requirement

Single

Rail/rail I/o Type

Power Supply Rejection Ratio

84dB

Single Supply Voltage (min)

2.2V

Single Supply Voltage (max)

5.5V

Dual Supply Voltage (min)

Not RequiredV

Dual Supply Voltage (max)

Not RequiredV

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Package Type

LLP

Lead Free Status / Rohs Status

Not Compliant

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LM4895

1 Watt Fully Differential Audio Power Amplifier With

Shutdown Select and Fixed 6dB Gain

General Description

The LM4895 is a fully differential audio power amplifier

primarily designed for demanding applications in mobile

phones and other portable communication device applica-

tions. It is capable of delivering 1 watt of continuous average

power to an 8Ω load with less than 1% distortion (THD+N)

from a 5V

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4895 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other low voltage appli-

cations where minimal power consumption is a primary re-

quirement.

The LM4895 features a low-power consumption shutdown

mode. To facilitate this, Shutdown may be enabled by either

logic high or low depending on mode selection. Driving the

shutdown mode pin either high or low enables the shutdown

select pin to be driven in a likewise manner to enable Shut-

down. Additionally, the LM4895 features an internal thermal

shutdown protection mechanism.

The LM4895 contains advanced pop & click circuitry which

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4895 has an internally fixed gain of 6dB.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

power supply.

FIGURE 1. Typical Audio Amplifier Application Circuit

DS200232

Key Specifications

Features

n Fully differential amplification

n Internal-gain-setting resistors

n Available in space-saving packages micro SMD, MSOP

n Ultra low current shutdown mode

n Can drive capacitive loads up to 500 pF

n Improved pop & click circuitry eliminates noises during

n 2.2 - 5.5V operation

n No output coupling capacitors, snubber networks or

n Shutdown high or low selectivity

Applications

n Mobile phones

n PDAs

n Portable electronic devices

and LLP

turn-on and turn-off transitions

bootstrap capacitors required

Improved PSRR at 217Hz

Power Output at 5.0V & 1% THD

Power Output at 3.3V & 1% THD

Shutdown Current

20023201

October 2002

400mW(typ.)

www.national.com

0.1µA(typ.)

1.0W(typ.)

80dB

Related parts for LM4895LDX

LM4895LDX Summary of contents

Page 1

... The LM4895 has an internally fixed gain of 6dB. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation Key Specifications j Improved PSRR at 217Hz j Power Output at 5.0V & 1% THD j Power Output at 3.3V & ...

Page 2

Connection Diagrams www.national.com 9 Bump micro SMD Package 20023236 Top View Order Number LM4895IBP See NS Package Number BPA09CDB LLP Package 20023235 Top View Order Number LM4895LD See NS Package Number LDA10B Mini Small Outline (MSOP) Package 20023223 Top View ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Thermal Resistance θ (LD) JC θ ...

Page 4

Electrical Characteristics V The following specifications apply for V 25˚C. (Continued) Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee ...

Page 5

Typical Performance Characteristics LD Specific Characteristics LM4895LD Power Dissipation vs Output Power Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Frequency 5V, 8Ω and PWR = 400mW DD L THD+N vs Frequency ...

Page 6

Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Frequency 2.6V, 4Ω and PWR = 150mW DD L THD+N vs Output Power 3V, 8Ω THD+N vs Output Power ...

Page 7

Typical Performance Characteristics Non-LD Specific Characteristics Power Supply Rejection Ratio (PSRR) V Input 10Ω Terminated Power Supply Rejection Ratio (PSRR) V Input 10Ω Terminated Output Power vs Supply Voltage (Continued Power Supply Rejection Ratio (PSRR 20023275 ...

Page 8

Typical Performance Characteristics Non-LD Specific Characteristics Power Dissipation vs Output Power Power Dissipation vs Output Power Supply Current vs Shutdown Voltage Shutdown Low www.national.com (Continued) Power Dissipation vs 20023281 20023283 Supply Current vs Shutdown Voltage 20023285 8 Output Power 20023282 ...

Page 9

Typical Performance Characteristics Non-LD Specific Characteristics Clipping (Dropout) Voltage vs Supply Voltage Power Derating Curve Input CMRR vs Frequency (Continued) Open Loop Frequency Response 20023287 20023289 Input CMRR vs Frequency 20023291 9 20023288 Noise Floor 20023290 20023292 www.national.com ...

Page 10

Typical Performance Characteristics Non-LD Specific Characteristics PSRR vs DC Common-Mode Voltage THD vs Common-Mode Voltage www.national.com (Continued) DC Common-Mode Voltage 20023293 Common-Mode Voltage 20023295 10 PSRR vs 20023294 THD vs 20023296 ...

Page 11

Application Information DIFFERENTIAL AMPLIFIER EXPLANATION The LM4895 is a fully differential audio amplifier that fea- tures differential input and output stages. Internally this is accomplished by two circuits: a differential amplifier and a common mode feedback amplifier that adjusts the ...

Page 12

Application Information However, a direct consequence of the increased power de- livered to the load by a bridge amplifier is an increase in internal power dissipation versus a single-ended amplifier operating at the same conditions 4*(V ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted X1 = 1.336 9-Bump micro SMD Order Number LM4895IBP NS Package Number BPA09CDB ± ± 0. 1.361 0. 0.850 13 ± 0.10 www.national.com ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) LLP Order Number LM4895LD NSPackage Number LDA10B 14 ...

Page 15

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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